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Response.Flush();

Posted on 2004-04-12
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Last Modified: 2008-02-01
why when i run or step trough this code, the html added to the page does not show at the moment of  Thread.Sleep?  thank you.

            placeholder.Controls.Clear();

                  string HTML = "";
                  HTML = "<table><tr><td>test</td></tr></table>";
            
                  Control objControl = this.Page.ParseControl(HTML);
                  this.placeholder.Controls.Add(objControl);


                  //Response.Clear();
                  Response.Buffer= true;
                  Response.Flush();
                  this.placeholder.Visible = true;
                  Thread.Sleep(15000);
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Question by:alain123
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12 Comments
 
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monosodiumg earned 250 total points
ID: 10805348
I think it's because you have flushed BEFORE you set the placeholder to visible. If it's not visible, it may not generate any HTML.
I'm assuming this is after PreRender. In it's before PreREnder, then it won't have gotten round to generating the HTML.
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by:alain123
ID: 10805602
hello, i'm doing this after InOnit() ... before pre-render.. i tried to change the this.placeholder.Visible = true; before flush(), but nothing.. still the same form..
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Expert Comment

by:monosodiumg
ID: 10805642
Then you are nto going to see any HTML in the output because none has been generated. yet.
Why are you flushing in OnInit? At that stage you have pretty much nothing to flush.

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Author Comment

by:alain123
ID: 10805679
no I'm not flushing inside OnInit().. but After.. I'm flushing inside a Button_Onclick() event  that it's called after OnInit()... and

"Then you are nto going to see any HTML in the output because none has been generated. yet" ..I'm adding the html to the control .. i think it should  be there, unless i'm not doind some kind of refreshing..

               HTML = "<table><tr><td>test</td></tr></table>";
         
               Control objControl = this.Page.ParseControl(HTML);
               this.placeholder.Controls.Add(objControl);
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Expert Comment

by:monosodiumg
ID: 10808979
Sorry alain, I've had very littel exposure to the finer points of using controls so I can't help.
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Author Comment

by:alain123
ID: 10809150
Thank you mon, for your help, i appreaciate it.
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Expert Comment

by:ptmcomp
ID: 10811177
Before the render method no html will be written to the output stream therefore Response.Flush() does not change anything. Response.Buffer should be changed in the beginning of the pages lifecycle so that either all contents or nothing is buffered.
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Expert Comment

by:ptmcomp
ID: 10811195
Place this code in OnPreRender:

              placeholder.Controls.Clear();

               string HTML = "";
               HTML = "<table><tr><td>test</td></tr></table>";
         
               Control objControl = this.Page.ParseControl(HTML);
               this.placeholder.Controls.Add(objControl);
               Response.Buffer= true;

Place this code in the overriden Render method:

               this.placeholder.Visible = true;
               Response.Flush();
               Thread.Sleep(15000);
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Assisted Solution

by:ptmcomp
ptmcomp earned 250 total points
ID: 10811204
Argh! The Visible property needs also to be set in the prerender method - else Render() will not produce any html.
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Expert Comment

by:AdrianJMartin
ID: 10811770
this works and you see the page 'filling up", it seams the Reponse object does not recognise the setting of Buffer to true until it has flushed the response automatically, I just pushed 300 spaces onto the stream as a test and it works.

            private void Button1_Click(object sender, System.EventArgs e)
            {
                  Response.Buffer= true;

//                  Response.Write( "0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789<br>" );
                  Response.Write( "                                                                                                        " );
                  Response.Write( "                                                                                                        " );
                  Response.Write( "                                                                                                        " );

                  Response.Flush();


                  Response.Write("test2");
                  for( int i = 0  ; i < 100 ; i ++ )
                  {
                        
                        Response.Write( string.Format("Message {0}<br>" , i ) ) ;
                        Response.Flush();
                        System.Threading.Thread.Sleep(100);
                  }
            }
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